[aprssig] Aprs used during fire

[scott at opentrac.org]

Or you could just mount a cheap compass on the assembly permanently for a
buck or two.  GPS receivers with magnetic compasses tend to be a little
expensive.

If the unit did have a GPS receiver, it'd need to be able to shut it off
after it gets a fix.  A tracker and 1-wire weather station will draw under
10 mA when not transmitting - no need to drain the batteries for a
non-moving station.

We were just talking yesterday about the possibility of adding another
low/medium current switch to the T2 to handle GPS power separately from
radio power.  A small FET like a 2N7000 could be used as a low-side switch
for up to 200 mA, but all of the available pins on the serial connector are
designated as inputs and a computer could assert +/- 12 volts on any of
those, which wouldn't be good for the FET.

Scott
N1VG

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Jason Winningham
> Sent: Tuesday, June 13, 2006 12:38 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] Aprs used during fire
> 
> 
> On Jun 13, 2006, at 2:34 PM, Curt, WE7U wrote:
> 
> > Or throw a Deluo in there for those cases where the weather station
> > might wander off on its own.
> 
> or if you don't want the setup time and confusion of adding a 
> GPS sync 
> to the setup.
> 
> make it a GPS with a built-in compass and you may be able to 
> figure out 
> a way around the "make sure it points north" requirement - 
> simplify it 
> to "hey you, go set this up on that hill over there.  this end points 
> up, flip this switch and make sure the light comes on."
> 
> -Jason
> kg4wsv
> 
> 
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